Correct Answer - D
For forward biasing of diode, `p`-side of diode should be at higher potential than `n`-side. The `p-n`junction diode can be shown as:
If `p`-side of `p-n`junction diode is given more
Positive potential than `n`-side, then it is forward biased.
In option (d), `p`-side is at `0V` and `n`-side at `-2V`, so `p`is at higher potential. Hence, it is a forward biased.
